Dental vibratory matrix



, 1,634,058 June 1927' T. TERAGAWA DENTAL VIBRATORY MATRI X Filed Dec. 6, 1926 INvE NTOR): TAKEO TERAGAWA.

,Bv HGAT Patented June 28, 1927. 2

e a ir a s r are 5 PA TENT O F! 6E;

Tame "I ERAGAWA, or Los'AuennEsfoALmoRmA.

DENTAL VIBRATORY MATRIX,

Application fi'led December 6, 1926. Serial in. 152,930.

This invention relates to certain improve ments in a matrix device for use in dentistry, and its objects are to simplify porcelain technology in seramic crown and bridge dentistry, and to expedite the processes pertaining thereto.

Other objects are-to produce on the porcelain tip an abutment for drawing a wax pattern in fitting gold backings, to provide means for vibrating the matrix whereby to produce in the porcelain powder a better lubrication and a more quick condensation thereof, and to provide improved clamping elements, whereby the porcelain tip is held in the desired position and in a perfect adjustment, and the engaging and disengaging of the porcelain facings is simplified.

The drawings forming a part of this specification, while showing an embodiment of the invention which I have so far found to be the most practical in use, are not to be taken as more than illustratlve of the invention, for the invention is capable of modification in form and location of parts in accordance with the scope of the appended claims.

In the drawings, Figure 1 is a top plan view of a dental matrix constructed in accordance with my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a sec- .tional elevation of the handle and shank, showing the vibratory elements in detail. Fig. e is an enlarged and fragmentary side view showing the device in use.

Referring to the drawings, the main plate 11, has mounted thereon a slidable holding member 12, the holding member 12, being retained thereon by stop pins 13, projecting from the slidable member, and working in slots 14 in plate 11. The main plate 11 has an integral and depending flange 15, to which is attached the handle shank 16. To hold the tooth form 17 in position. I provide a movable jaw 18, supported by rods 19, which extend through the depending flange 15. A plate 20, connecting the extremities of rods 19, may be pressed by the operator to release the tooth form. Springs 21, are interposed between the plate 20 and flange 15, and tend to force the jaw 18 to operative position and in engagement with the tooth form 17, when held in the matrix.

The handle shank 16 has mounted therein a toothed wheel 22. A vibratory spring 23, extends in slot 24-, in the shank, and is in engagement with wheel 22, and has holes 25, for adjustment. A screw 26 serves to hold the spring in adjusted position. On the shank, I mount a handle 27, secured in an adjusted position by a screw 28. The handle may be adjusted to and from the holding elements.

At the junction of the top plate and depending flange, I provide an aperture 29,

having a notch 30, and serving to support 7 abutment edges for porcelain facings and for fitting gold backings, and the movable jaw actuated by springs, serves to retain the porcelain facings.

IV hat is claimed is:

1. In a dental matrix, a plate member having a top face and a depending flange, a spring-actuated movable jaw in opposed relation to the depending flange, a cover slidable on the top face and mounted in opposed relation to the movable jaw, a handle for the plate member. and vibratory elements in the handle adapted for manual manipulation.

2. In a dental matrix, a plate member having a top face and a depending flange and an aperture at the juncture of the top face and the depending flange, a springactuated movable jaw in opposed relation to the depending flange, a cover slidable on the top face and mounted in opposed relation to the movable jaw, a handle fixed to the plate member, and vibratory elements mounted in the handle and adapted for manual manipulation.

3. In adental matrix of the character set forth, a plate member having a plate portion and a flange portion integral there with and depending from the plate portion,

and an aperture at the junction of said plate and flange portions capable of receiving a tooth form a spring-actuated movable jaw mounted in opposed relation to the depending flange portion, a cover slidalole 0n the top plate portion and mounted in opposed relation to the movable jaw, a handle fixed to the flange portion of the plate member, and manually actuated vibratory elements mounted in the handle.

In testimony whereof, I hereunto afiix my signature.

' TAKEO TERAGAWA. 

